using Microsoft.JSInterop;
using System;
using System.Threading.Tasks;

namespace cwebplusApp.Shared.Services {

    public class PermissionsProvider {

        private bool _isGeoLocationAllowed;

        public delegate void GeoLocationPermissionChangeCallBack(bool allowed);
        private GeoLocationPermissionChangeCallBack _geoLocationPermissionChangeCallBack;

        public IJSRuntime JSRuntime { get; set; }

        public bool IsGeoLocationAllowed { 
            get {
                Console.WriteLine("IsGeoLocationAllowed.Get {0}", _isGeoLocationAllowed);
                return _isGeoLocationAllowed; 
            }
            set {
                Console.WriteLine("IsGeoLocationAllowed.Set {0}", value);
                _isGeoLocationAllowed = value; 
            } 
        }

        public PermissionsProvider(IJSRuntime _jSRuntime) {
            this.JSRuntime = _jSRuntime;
           initialize();
        }

        [JSInvokable]
        public void GeoLocationPermissionChanged(string geoLocationStatus) {
            IsGeoLocationAllowed = (geoLocationStatus.Equals("granted") || geoLocationStatus.Equals("prompt")) ? true : false;
            this._geoLocationPermissionChangeCallBack(IsGeoLocationAllowed);
        }

        public void SetGeoLocationPermissionChangeCallBack(GeoLocationPermissionChangeCallBack callback) {
            this._geoLocationPermissionChangeCallBack = callback;
        }

        public void RemoveOnlineStatusChangeCallBack() {
            this._geoLocationPermissionChangeCallBack = null;
        }


        private async void initialize() {
            Console.WriteLine("PermissionsProvider.initialize");
            await GeoLocationAllowed();
        }

        private async Task<bool> GeoLocationAllowed() {
            Console.WriteLine("PermissionsProvider.GeoLocationAllowed");
            var dotNetObjRef = DotNetObjectReference.Create(this);
            string result = await JSRuntime.InvokeAsync<string>("IsGeoLocationAllowed", dotNetObjRef);
            this.IsGeoLocationAllowed = result.Equals("granted") || result.Equals("prompt");
            Console.WriteLine("PermissionsProvider.GeoLocationAllowed result={0}", result);
            return IsGeoLocationAllowed;
        }

    }
}